<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .test .one{
            font-family:'隶书','黑体';
            font-size:50px;
        }
        .test .two{
            font-family:'宋体';
            font-size: 1.3rem;
            font-weight: 400;
        }
        .test .three{
            font-style: normal;
        }
    </style>
</head>
<body>
    <div class="test">
        <div class="one">
            这是隶书
        </div>
        <div class="two">
            这是宋体
        </div>
        <em class="three">
            这是em标签
        </em>
    </div>


    <!-- 
    font size——>
    px  或者rem
    默认大小就是1rem
     -->

    <!--
    font-weight 粗细
    100px---900px
    400--》normal
    700---》bold
     -->

    <!--
        font-style:italic->倾斜
                    normal——》正常

    -->
</body>
</html>